Hi Jim,
...
It's all very simple physics. Look at the size of the loudspeaker. Its
low frequency output is limited by its size as a fraction of a
wavelength. The K3 and K3S are designed as compact, light weight
radios. The speaker used is quite good for its size. If you want big
bass, you need a big loudspeaker (or at least one a lot bigger than
the little guy in the K3 and K3S). BUT -- ham radio is NOT about high
fidelity, it's about COMMUNICATIONS quality sound.
Having the sub receiver doubles my listening pleasure. I use a pair of
old RS Minimus-7 speakers with my original K3, and am using a pair of
Jensen Powered Speakers (JPS 45) with my K3S. Getting excellent sound
from both systems.
Nearly a century ago, Bell Labs learned through a lot of research that
all it takes for communications is smooth (flat) response between
about 500 Hz and 3 kHz, and the telephone system was designed around
that bandwidth.
As a former Bell head (BTL in Denver) working on PBX systems in the
1970s I was exposed to the training for many telephone products. The
plain old telephone service, POTS, was designed for a 3000 Hz bandwidth
(300-3300).
In the 1960s while earning my EE degree I worked in the broadcast
business. Our main studio to transmitter link was an equalized line, but
the backup circuit was a POTS line. Fortunately we didn't need to press
it into service often, but on those occasions it sure sounded crappy by
comparison to the usual AM 6 kHz or so eq'd circuit. And much more so
when we added an FM station to the mix.
73,
Gus Hansen
KB0YH
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